I have a REGISTER coming in from the network - I have manually added details into the subscriber detail (due to problems with SERWeb and IMAP but thats another story) and so coulns like ha1 and ha2 are blank for the time being. Everything else looks above board but I am seeing the following:- 0(23824) check_nonce(): comparing [46643f80108c909178ea9d240a28fdc0c4eb74fc] and [46643f80108c909178ea9d240a28fdc0c4eb74fc] 0(23824) check_response(): Our result = '5fa07ee2806bae5342a8122fc0fde028' 0(23824) check_response(): Authorization failed 0(23824) build_auth_hf(): 'WWW-Authenticate: Digest realm="aa.bb.cc.ddd", nonce="46643f80108c909178ea9d240a28fdc0c4eb74fc" What needs to be in place in order for the authorization to work - there is obviously some kind of chksum going here but I am not sure what exactly. Regards, Steve.